Ticket #41624: 41624.0.diff

src/wp-admin/js/customize-widgets.js

@@ -593 +593 @@
                         var self = this, $widgetInside, $widgetForm, $customizeSidebar,
                                 $themeControlsContainer, positionWidget;
 
-                        if ( ! this.params.is_wide ) {
+                        if ( ! this.params.is_wide || $( window ).width() <= 640 ) {
                                 return;
                         }